US20150113964A1 - Systems and methods for control of engine nox emissions using liquid and dry reductant sources - Google Patents
Systems and methods for control of engine nox emissions using liquid and dry reductant sources Download PDFInfo
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- US20150113964A1 US20150113964A1 US14/064,591 US201314064591A US2015113964A1 US 20150113964 A1 US20150113964 A1 US 20150113964A1 US 201314064591 A US201314064591 A US 201314064591A US 2015113964 A1 US2015113964 A1 US 2015113964A1
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Images
Classifications
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- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02C20/00—Capture or disposal of greenhouse gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T10/12—Improving ICE efficiencies
Definitions
- the technical field generally relates to control of engine NOx emissions, and more particularly using both liquid and dry reductant sources to control engine NOx emissions in selective catalytic reduction (SCR) systems.
- SCR selective catalytic reduction
- Heavy duty and other diesel engine types utilize a reductant in a diesel exhaust fluid such as urea in the treatment and reduction of NOx levels in the exhaust.
- the liquid urea is injected into the exhaust stream upstream of the SCR catalyst.
- drawbacks such as the formation of urea deposits in the exhaust system. While superheating of the liquid urea can be used during low temperature conditions to obtain gaseous ammonia and reduce deposit formation, these systems are costly and impractical in many applications.
- Solid storage media systems have been developed for ammonia storage in reductant delivery systems for selective catalytic reduction (SCR).
- the solid storage media systems typically provide a dry source of reductant, such as ammonia, stored in the solid storage media that is contained in a cartridge.
- the ammonia is released from the solid storage media in gaseous form as needed and delivered to an exhaust gas to treat emissions in an SCR aftertreatment system.
- these systems present drawbacks in heavy duty engine and other high volume applications due to the high cost of the cartridges and the need for frequent servicing to change the cartridge.
- Embodiments includes unique reductant delivery systems that include a dry reductant source and a liquid reductant source which are operable to selectively provide gaseous reductant and liquid reductant, respectively, to an exhaust aftertreatment system for treatment and reduction of NOx emissions.
- Other embodiments include unique methods, systems, and apparatus to provide gaseous reductant from a dry reductant source to an exhaust aftertreatment system for treatment of NOx emissions under a first temperature condition associated with the exhaust system and to provide liquid reductant from a liquid reductant source for treatment of NOx emissions under a second temperature condition associated with the exhaust system.
- the temperature condition is a liquid reductant temperature threshold.
- the exhaust aftertreatment system can include an SCR catalyst that is connected to receive exhaust gas from an internal combustion engine and that is operable with the reductant to reduce NOx emissions.
- FIG. 1 is a schematic diagram of one embodiment system for providing reductant from dry and liquid reductant sources to an internal combustion engine exhaust aftertreatment system.
- FIG. 2 is a flow diagram of one embodiment of a procedure for selectively providing liquid reductant from a liquid reductant source and gaseous reductant from a dry reductant source to an exhaust aftertreatment system.
- FIG. 3 is a schematic diagram of an apparatus for selectively providing reductant to an exhaust aftertreatment system from a dry reductant source and a liquid reductant source.
- FIG. 1 is a schematic diagram of a system 100 for control of engine NOx emissions using a gaseous reductant and a liquid reductant.
- the gaseous reductant is stored in a dry solid storage media that releases the reductant in gaseous form when heated.
- the gaseous reductant is provided via a metered flow to the exhaust system upstream of the SCR catalyst under a first set of temperature conditions associated with the exhaust system.
- the liquid reductant is stored in a liquid medium such as diesel exhaust fluid or urea in a storage tank or the like and provided by controlled injection of the liquid medium into the exhaust stream upstream of the SCR catalyst under second set of temperature conditions associated with the exhaust system.
- an SCR catalyst includes any suitable NOx conversion catalyst.
- the temperature condition of the exhaust stream can be any one or combination of, for example, an exhaust gas temperature, an SCR catalyst temperature, an estimated catalyst or wall temperature at the location of liquid urea dosing, or temperature of any component in the exhaust or aftertreatment system.
- the temperature condition can be determined by physical measurements or estimated temperatures determined virtually or by algorithm.
- the system 100 includes an internal combustion engine 102 operable to produce a flow of an exhaust gas stream into an exhaust system that includes exhaust flow path 116 and other components.
- engine 102 is a diesel engine.
- the exhaust gas output by engine 102 includes NOx and other components which are to be reduced before outlet to the environment using an exhaust aftertreatment system in exhaust flow path 116 and the dry and liquid reductant sources connected to the exhaust flow path 116 .
- System 100 is illustrated schematically and may be included with a car, truck, semi, bus, boat, recreational vehicle, construction equipment, locomotive, or other type of vehicle. Other embodiments include an engine provided in non-vehicular applications such as a generator set.
- the system 100 includes an aftertreatment system with SCR catalyst 104 in exhaust flow path 116 that reduces at least a portion of the amount of NOx from the exhaust stream.
- System 100 also includes a gaseous reductant source 108 that stores an amount of a dry NOx reductant such as, for example, ammonia (NH 3 ), in a solid storage media.
- a dry NOx reductant such as, for example, ammonia (NH 3 )
- the solid storage media may be any material involving adsorption or absorption of molecular ammonia in the solid, or a solid chemical compound which can be manipulated in order to produce gaseous ammonia.
- the solid storage media includes metal ammine salts.
- the NOx reductant stored in the solid storage media housed in reductant source 108 may be ammonia or any other reductant understood in the art capable of being stored and selectively released from a solid storage media.
- Reductant source 108 may include a cartridge or housing providing one or more storage units having one or more compartments for storing ammonia in solid storage media.
- System 100 also includes a first reductant delivery system 120 that receives gaseous reductant released from the solid storage media in reductant source 108 , and provides the gaseous reductant to the exhaust flow path 116 at a position upstream of the NOx conversion catalyst 104 .
- Gaseous reductant passes through a reductant supply line 121 from reductant source 108 to a metering device 106 and from metering device 106 to a mixer 107 connected in fluid communication with exhaust flow path 116 .
- the mixer 107 is located upstream of the SCR catalyst 104 .
- Mixer 107 is supplied with gaseous reductant from reductant source 108 and is operable to mix reductant gas with exhaust gas in exhaust flow path 116 .
- Reductant delivery system 120 may include sensors, control valves, heating sources, coolant lines, and other devices useful in the release of gaseous reductant from the solid storage media and in the delivery of the gaseous reductant to the exhaust flow path 116 in the desired amount, rate and timing.
- gaseous reductant source 108 is operatively coupled with at least one engine coolant feed line and an engine coolant return line that provide a source of heat that heats the solid storage media stored in reductant source 108 to release the stored reductant in gaseous form.
- Other embodiments contemplate other means for heating the solid storage media in reductant source 108 , including, for example, an electrical heating element coupled to a power source such as a battery or generator.
- the heat source can be embedded in the solid storage media, or can extend around the outside of the solid storage media, or a combination of these arrangements. In one embodiment, heating of the solid storage material releases gaseous NH 3 from the solid storage media into supply line 121 by thermal desorption.
- the consumption rate of the released NH 3 gas is measured by metering device 106 as it is mixed into exhaust flow path 116 upstream of the SCR catalyst 104 .
- Pressure/temperature sensor 118 provide signals corresponding to the pressure of the gas released into supply line 121 and signals corresponding to the temperature of the solid storage media in reductant source 108 for control of the release of the reductant gas.
- the temperature and pressure signals may be provided continuously or discretely, and by a single device or separate devices.
- System 100 also includes a liquid reductant source 110 that stores an amount of liquid NOx reductant such as, for example, ammonia (NH 3 ), in a liquid storage medium.
- a liquid reductant source 110 that stores an amount of liquid NOx reductant such as, for example, ammonia (NH 3 ), in a liquid storage medium.
- the liquid storage medium is diesel exhaust fluid stored in a tank.
- Other liquid reductant storage mediums such as urea are also contemplated.
- System 100 also includes a second reductant delivery system 122 that receives liquid reductant in the liquid storage medium released from the liquid reductant source 110 , and provides the liquid reductant to the exhaust flow path 116 at a position upstream of the SCR catalyst 104 .
- Liquid reductant passes through a reductant supply line 123 from reductant source 110 to a dosing device 114 and from dosing device 114 to an injector 112 connected in fluid communication with exhaust flow path 116 .
- the injector 112 is located upstream of the SCR catalyst 104 .
- Injector 112 is supplied with liquid reductant from reductant source 110 and is operable to inject or otherwise mix liquid reductant into exhaust flow path 116 for mixing with exhaust gas.
- Reductant delivery system 122 may include sensors, control valves, heating sources, coolant lines, and other devices useful in the delivery of liquid reductant from the storage source 110 to the exhaust flow path 116 in the desired amount, rate and timing.
- the exhaust aftertreatment system may include an oxidation catalyst 130 which is in fluid communication with exhaust flow path 116 and is operable to catalyze oxidation of one or more compounds in the exhaust gas flowing through exhaust flow path 116 , for example, oxidation of unburned hydrocarbons or oxidation of NO to NO 2 .
- Oxidation catalyst 130 can be any of various flow-through oxidation catalysts.
- oxidation catalyst 130 includes a substrate with an active catalyst layer configured to oxidize at least some particulate matter (e.g., the soluble organic fraction of soot) in the exhaust and reduce unburned hydrocarbons and CO in the exhaust to less environmentally harmful compounds.
- the oxidation catalyst 130 may sufficiently reduce the hydrocarbon and CO concentrations in the exhaust to meet the requisite emissions standards.
- the exhaust aftertreatment system may also include a diesel particulate filter 132 in fluid communication with exhaust flow path 116 and operable to reduce the level of particulates in exhaust flowing through exhaust flow path 116 .
- diesel particulate filter 132 is a catalyzed soot filter.
- the diesel particulate filter 132 can be any of various particulate filters known in the art configured to reduce particulate matter concentrations, e.g., soot and ash, in the exhaust gas to meet requisite emission standards.
- the diesel particulate filter 132 includes a filter substrate that captures soot and other particulate matter generated by the engine 102 .
- the system 100 periodically regenerates diesel particulate filter 132 to remove particulate matter that has accumulated on the diesel particulate filter over time.
- diesel particulate filter 132 can be regenerated by increasing the temperature of the exhaust gas above a threshold temperature corresponding with combustion of the particulate matter.
- the system 100 includes an exhaust gas recirculation (EGR) line (not shown) configured to allow a portion of the exhaust gas generated by the engine to recirculate back into the engine for altering the combustion properties of the engine 102 .
- the exhaust aftertreatment system may further include a hydrocarbon (HC) injector (not shown) which is supplied with HC from an HC reservoir and is operationally coupled to the exhaust stream at a position upstream of SCR catalyst 104 .
- HC hydrocarbon
- Other embodiments of system 100 may include engine 102 having a common rail fuel system capable of injecting a post injection fuel where at least a portion of the post injection fuel does not combust to provide HC in the exhaust stream.
- Embodiments are also contemplated without a HC injector.
- Certain embodiments may also include an ammonia oxidation AMOX catalyst (not shown) at a position downstream of the SCR catalyst 104 , which is operable to catalyze the reaction of NH 3 which slips past the SCR catalyst
- Reductant gas or liquid injected into exhaust flow path 116 is provided to the SCR catalyst 104 which is in flow communication with exhaust flow path 116 and is operable to catalyze the reduction of NO x .
- SCR catalyst 104 can be any of various catalysts known in the art.
- the SCR catalyst with a zeolite based catalyst such as a Cu-Zeolite or a Fe-Zeolite catalyst, or a vanadium based catalyst.
- Exhaust flow path 116 may be provided in a variety of physical configurations.
- an exhaust flow path proceeds from the output of a turbocharger (not shown) of engine 102 through a conduit to a structure containing oxidation catalyst 130 and diesel particulate filter 132 , through a second conduit to a structure containing the SCR catalyst 104 and through another conduit which outlets to the ambient environment.
- the components of the exhaust gas after-treatment system can be positioned in any of various arrangements, and the system can include other components or fewer components.
- exhaust gas treated in the exhaust gas after-treatment system and released into the atmosphere consequently contains significantly fewer pollutants, such as diesel particulate matter, NOx, hydrocarbons, and carbon monoxide, than untreated exhaust gas.
- the system 100 further includes a controller 124 that performs certain operations for controlling reductant delivery to exhaust flow path 116 from first reductant source 108 and second reductant source 110 in response to a temperature condition associated with the exhaust system.
- a temperature condition associated with the exhaust system can include a temperature condition of SCR catalyst 104 , a temperature condition of exhaust gas at the exhaust manifold or the connection of engine 102 with exhaust flow path 116 , a downstream temperature condition of the exhaust gas in exhaust flow path 116 , or a temperature condition of a component of the exhaust system.
- the temperature condition can also be a combination, average, weighted average, of these temperature conditions or other suitable determination of a temperature condition associated with the exhaust system determined from temperature sensors, derived from temperature sensors, or determined from operating conditions.
- controller 124 is configured to determine the temperature condition of the exhaust system is in a low temperature range and control first reductant source 108 to provide gaseous reductant to the exhaust flow path 116 . Controller 124 is also configured to determine the temperature condition of the exhaust system is above the low temperature range and control second reductant source 110 to provide liquid reductant to the exhaust flow path 116 .
- the controller 124 may include modules structured to functionally execute operations to determine the temperature condition and control reductant delivery in response to the temperature condition.
- the controller 124 includes an exhaust system temperature condition module that is configured to determine the temperature condition associated with the exhaust system and a reductant source selection module configured to select reductant source 108 or reductant source 110 in response to the temperature condition.
- Controller 124 is connected to various sensors to receive or determine operating parameters of system 100 and to provide certain control outputs in response to the operating parameters according to programmed instructions.
- controller 124 is connected to NOx sensors 140 and temperature sensors 142 to receive inputs regarding the operation of the exhaust system and the performance, such as NOx conversion efficiency, of the aftertreatment system.
- Pressure sensor or differential pressure sensor 144 provides signals regarding the pressure associated with particulate filter 132
- ammonia sensor 146 provides signals regarding a mid-bed ammonia amount of SCR catalyst 104 for feedback control of reductant delivery along with NOx sensors 140 .
- Additional sensors associated with the exhaust system can be provided and are not shown, such as additional NOx and/or temperature sensors at other locations, other ammonia sensors, and flow sensors.
- Controller 124 may include one or more modules as discussed above structured to functionally execute the operations described herein.
- Controller 124 forms a portion of a processing subsystem including one or more computing devices having memory as well as a number of inputs and outputs for interfacing with various sensors and subsystems of system 100 .
- Controller 124 can include an electronic circuit comprised of one or more components, including digital circuitry, analog circuitry, or both. Controller 124 may be a single device or a distributed device. Controller 124 may include one or more control algorithms defined by operating logic in the form of software instructions, hardware instructions, firmware instructions, dedicated hardware, or the like.
- controller 124 is of a programmable microcontroller solid-state integrated circuit type that includes memory and one or more central processing units.
- the memory of controller 124 includes of one or more components and can be of any of volatile or nonvolatile, solid-state, optical media, magnetic media, combinations of these, or other types of memory.
- Controller 124 can include signal conditioners, signal format converters (such as analog-to-digital and digital-to-analog converters), limiters, clamps, filters, and the like as needed to perform various control and regulation operations described herein.
- Controller 124 may be a type of controller sometimes referred to as an electronic or engine control module (ECM), electronic or engine control unit (ECU) or the like, that is directed to the regulation and control of engine operation.
- ECM electronic or engine control module
- ECU electronic or engine control unit
- controller 124 may be dedicated to the control of just the operations described herein or to a subset of controlled aspects of system 100 .
- procedure 200 includes an operation 202 to determine an operating condition of engine 102 .
- Engine operating condition determinations can include determining operating conditions that produce exhaust gas to respond to a torque request or to satisfy a torque demand, that correspond to an engine start-up request or start-up condition, that correspond to an engine shut-down request or condition, or that correspond to an eminent engine shut-down condition.
- Procedure 200 further includes an operation 204 to determine a temperature condition associated with the exhaust system.
- the temperature condition can correspond to a temperature of the exhaust gas at one or more locations, a temperature of SCR catalyst 104 , a temperature condition of a component of the exhaust system, or a combination of these.
- the temperature condition can be determined from a single input from a temperature sensor or combination of sensors, an average or other determination based on a number of inputs from one or more temperature sensors, an input from a virtual temperature sensor, or a derived or calculated value from operating conditions.
- Procedure 200 continues at conditional 206 to determine if the temperature condition associated with the exhaust system is greater than or equal to a liquid reductant threshold temperature.
- the liquid reductant threshold temperature can be, for example, a temperature at or above which liquid reductant is effectively hydrolyzed in the exhaust gas to prevent or reduce deposit formation in the exhaust system. Other liquid reductant threshold temperatures are also contemplated and not precluded.
- procedure 200 continues at operation 208 and provides the gaseous reductant from gaseous reductant source 108 to the exhaust system. If conditional 206 is positive, procedure 200 continues at operation 210 and provides liquid reductant from liquid reductant source 110 to the exhaust system.
- first reductant source 108 includes replaceable cartridges of solid storage media with stored dry reductant that are removed and replaced with another cartridge when empty.
- the engine operating condition determination 202 and/or exhaust temperature condition determination 204 can include a reductant storage capacity determination of the SCR catalyst 104 and an eminent engine shut-down condition determination. If storage capacity on SCR catalyst 104 is available, an eminent engine shut-down condition determination can result in an operation to dose liquid reductant from second reductant source 110 to store reductant on SCR catalyst 104 for NOx reduction in a subsequent engine cold start while the catalyst temperature is still above the liquid reductant dosing threshold.
- the engine operating condition determination 202 and/or exhaust temperature condition determination 204 can include a reductant storage capacity determination of the SCR catalyst 104 and an engine shut-down condition determination. If storage capacity on SCR catalyst 104 is available, an engine shut-down condition determination can result in an operation to provide gaseous reductant from first reductant source 108 to store reductant on SCR catalyst 104 for NOx reduction in a subsequent engine cold start while the catalyst temperature is below the liquid reductant dosing threshold.
- the engine operating condition determination 202 and/or exhaust temperature condition determination 204 can include a reductant storage capacity determination of the SCR catalyst 104 and an engine start-up condition determination.
- the start-up condition can be determined based on, for example, ambient conditions, a door switch activation, a key-switch activation, a key-on delay timing, a time-of-day, a day of week, a preprogrammed schedule, an operator input, or other start-up indicator.
- an engine start-up determination can result in an operation to provide gaseous reductant from first reductant source 108 to store reductant on SCR catalyst 104 for NOx reduction in the subsequent engine start-up while the catalyst temperature is below the liquid reductant dosing threshold.
- gaseous reductant from first reductant source 108 is provided upon engine start-up following a pre-determined amount of key-off time when ambient temperature is below a pre-determined threshold.
- the controller 124 is configured to use only one of reductant sources 108 , 110 when the other reductant source is determined to be unavailable due to, for example, being empty or malfunctioning.
- an indicator is provided to the driver when one of the reductant sources is empty or malfunctioning, but operation of the vehicle is maintained by providing reductant exclusively from the other reductant source until service is completed.
- controller 124 is configured to use dry reductant source 108 exclusively in response to an estimated urea deposit build-up or accumulation in the aftertreatment system exceeding a predetermined limit, or in response to a determination of a freezing condition associated with liquid reductant source 110 or any of its components connecting it the exhaust system.
- the determination of urea deposit thresholds or limits and frozen or potentially frozen/stuck/blocked conditions can be performed by any known technique.
- the determination of the freezing condition can be a determination of a cold weather condition likely to cause a freezing condition, of an actual frozen condition, or of a blocked condition associated with a temperature of the liquid reductant or a blockage preventing or reducing flow of the liquid reductant.
- reductant from both first reductant source 108 and second reductant source 110 is used simultaneously under certain operating conditions, such as during a transition from supplying reductant only from the dry reductant source to supplying reductant only from the liquid reductant source.
- an apparatus including controller 124 includes an exhaust system temperature condition module 300 structured to determine a temperature condition associated with the exhaust system.
- the controller 124 also includes a reductant source selection module 302 structured to control the selection and dosing of gaseous reductant from the first reductant source 108 and liquid reductant from the liquid reductant source 110 in response to the temperature condition determination.
- Exhaust system temperature condition module 300 is structured to receive one or more temperature inputs 306 associated with the exhaust system and provide an exhaust system temperature condition output 308 . In one embodiment, the exhaust system temperature condition module 300 is further structured to determine the temperature condition in response to an imminent engine shut-down or completed engine shutdown. In yet a further embodiment, the exhaust system temperature condition module 300 is structured to determine the temperature condition in response to an engine start-up condition.
- the reductant source selection module 302 is structured to receive and interpret the temperature condition output 308 and provide a reductant source selection command 312 that controls providing gaseous reductant from the first reductant source 108 if the temperature condition 308 is less than a liquid reductant temperature threshold 310 and providing liquid reductant from the second reductant source 110 if the temperature condition 308 is greater than or equal to the liquid reductant temperature threshold 310 .
- reductant source selection module 302 is structured to select reductant source 108 or reductant source 110 based on the temperature condition output 308 in response to an eminent engine shut-down condition, an engine shut-down condition, or engine start-up condition based on a reductant storage capacity of SCR catalyst 104 .
- reductant source selection module 302 is structured to select one of reductant source 108 , 110 in response to an empty or malfunction condition of the other reductant source, and to select reductant source 108 in response to a urea deposit condition or a freezing condition associated with second reductant source 110 .
Abstract
Description
- The technical field generally relates to control of engine NOx emissions, and more particularly using both liquid and dry reductant sources to control engine NOx emissions in selective catalytic reduction (SCR) systems.
- Heavy duty and other diesel engine types utilize a reductant in a diesel exhaust fluid such as urea in the treatment and reduction of NOx levels in the exhaust. The liquid urea is injected into the exhaust stream upstream of the SCR catalyst. However, when exhaust temperatures are low, the effectiveness of liquid urea in the treatment of NOx emissions suffers from drawbacks, such as the formation of urea deposits in the exhaust system. While superheating of the liquid urea can be used during low temperature conditions to obtain gaseous ammonia and reduce deposit formation, these systems are costly and impractical in many applications.
- Solid storage media systems have been developed for ammonia storage in reductant delivery systems for selective catalytic reduction (SCR). The solid storage media systems typically provide a dry source of reductant, such as ammonia, stored in the solid storage media that is contained in a cartridge. The ammonia is released from the solid storage media in gaseous form as needed and delivered to an exhaust gas to treat emissions in an SCR aftertreatment system. However, these systems present drawbacks in heavy duty engine and other high volume applications due to the high cost of the cartridges and the need for frequent servicing to change the cartridge.
- Therefore, there remains a need for further improvements in the architecture of reductant delivery systems, and in the control of reductant delivery systems to reduce NOx emissions in low temperature operating conditions, that are practical for heavy duty engine applications among others, while reducing cost and complexity. The present invention meets these and other needs according to the following described embodiments.
- Embodiments includes unique reductant delivery systems that include a dry reductant source and a liquid reductant source which are operable to selectively provide gaseous reductant and liquid reductant, respectively, to an exhaust aftertreatment system for treatment and reduction of NOx emissions. Other embodiments include unique methods, systems, and apparatus to provide gaseous reductant from a dry reductant source to an exhaust aftertreatment system for treatment of NOx emissions under a first temperature condition associated with the exhaust system and to provide liquid reductant from a liquid reductant source for treatment of NOx emissions under a second temperature condition associated with the exhaust system. In one embodiment, the temperature condition is a liquid reductant temperature threshold. The exhaust aftertreatment system can include an SCR catalyst that is connected to receive exhaust gas from an internal combustion engine and that is operable with the reductant to reduce NOx emissions.
- This summary is provided to introduce a selection of concepts that are further described below in the illustrative embodiments. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter. Further embodiments, forms, objects, features, advantages, aspects, and benefits shall become apparent from the following description and drawings.
- The description herein makes reference to the accompanying drawings wherein like reference numerals refer to like parts throughout the several views, and wherein:
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FIG. 1 is a schematic diagram of one embodiment system for providing reductant from dry and liquid reductant sources to an internal combustion engine exhaust aftertreatment system. -
FIG. 2 is a flow diagram of one embodiment of a procedure for selectively providing liquid reductant from a liquid reductant source and gaseous reductant from a dry reductant source to an exhaust aftertreatment system. -
FIG. 3 is a schematic diagram of an apparatus for selectively providing reductant to an exhaust aftertreatment system from a dry reductant source and a liquid reductant source. - For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, any alterations and further modifications in the illustrated embodiments, and any further applications of the principles of the invention as illustrated therein as would normally occur to one skilled in the art to which the invention relates are contemplated herein.
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FIG. 1 is a schematic diagram of asystem 100 for control of engine NOx emissions using a gaseous reductant and a liquid reductant. The gaseous reductant is stored in a dry solid storage media that releases the reductant in gaseous form when heated. The gaseous reductant is provided via a metered flow to the exhaust system upstream of the SCR catalyst under a first set of temperature conditions associated with the exhaust system. The liquid reductant is stored in a liquid medium such as diesel exhaust fluid or urea in a storage tank or the like and provided by controlled injection of the liquid medium into the exhaust stream upstream of the SCR catalyst under second set of temperature conditions associated with the exhaust system. As used herein, an SCR catalyst includes any suitable NOx conversion catalyst. In addition, the temperature condition of the exhaust stream can be any one or combination of, for example, an exhaust gas temperature, an SCR catalyst temperature, an estimated catalyst or wall temperature at the location of liquid urea dosing, or temperature of any component in the exhaust or aftertreatment system. Furthermore, the temperature condition can be determined by physical measurements or estimated temperatures determined virtually or by algorithm. - The
system 100 includes aninternal combustion engine 102 operable to produce a flow of an exhaust gas stream into an exhaust system that includesexhaust flow path 116 and other components. In one specific embodiment,engine 102 is a diesel engine. The exhaust gas output byengine 102 includes NOx and other components which are to be reduced before outlet to the environment using an exhaust aftertreatment system inexhaust flow path 116 and the dry and liquid reductant sources connected to theexhaust flow path 116.System 100 is illustrated schematically and may be included with a car, truck, semi, bus, boat, recreational vehicle, construction equipment, locomotive, or other type of vehicle. Other embodiments include an engine provided in non-vehicular applications such as a generator set. - The
system 100 includes an aftertreatment system withSCR catalyst 104 inexhaust flow path 116 that reduces at least a portion of the amount of NOx from the exhaust stream.System 100 also includes agaseous reductant source 108 that stores an amount of a dry NOx reductant such as, for example, ammonia (NH3), in a solid storage media. In one embodiment, the solid storage media may be any material involving adsorption or absorption of molecular ammonia in the solid, or a solid chemical compound which can be manipulated in order to produce gaseous ammonia. In one particular embodiment, the solid storage media includes metal ammine salts. The NOx reductant stored in the solid storage media housed inreductant source 108 may be ammonia or any other reductant understood in the art capable of being stored and selectively released from a solid storage media.Reductant source 108 may include a cartridge or housing providing one or more storage units having one or more compartments for storing ammonia in solid storage media. -
System 100 also includes a firstreductant delivery system 120 that receives gaseous reductant released from the solid storage media inreductant source 108, and provides the gaseous reductant to theexhaust flow path 116 at a position upstream of theNOx conversion catalyst 104. Gaseous reductant passes through areductant supply line 121 fromreductant source 108 to ametering device 106 and frommetering device 106 to amixer 107 connected in fluid communication withexhaust flow path 116. Themixer 107 is located upstream of theSCR catalyst 104.Mixer 107 is supplied with gaseous reductant fromreductant source 108 and is operable to mix reductant gas with exhaust gas inexhaust flow path 116.Reductant delivery system 120 may include sensors, control valves, heating sources, coolant lines, and other devices useful in the release of gaseous reductant from the solid storage media and in the delivery of the gaseous reductant to theexhaust flow path 116 in the desired amount, rate and timing. - In one embodiment, gaseous
reductant source 108 is operatively coupled with at least one engine coolant feed line and an engine coolant return line that provide a source of heat that heats the solid storage media stored inreductant source 108 to release the stored reductant in gaseous form. Other embodiments contemplate other means for heating the solid storage media inreductant source 108, including, for example, an electrical heating element coupled to a power source such as a battery or generator. The heat source can be embedded in the solid storage media, or can extend around the outside of the solid storage media, or a combination of these arrangements. In one embodiment, heating of the solid storage material releases gaseous NH3 from the solid storage media intosupply line 121 by thermal desorption. The consumption rate of the released NH3 gas is measured bymetering device 106 as it is mixed intoexhaust flow path 116 upstream of theSCR catalyst 104. Pressure/temperature sensor 118 provide signals corresponding to the pressure of the gas released intosupply line 121 and signals corresponding to the temperature of the solid storage media inreductant source 108 for control of the release of the reductant gas. The temperature and pressure signals may be provided continuously or discretely, and by a single device or separate devices. -
System 100 also includes aliquid reductant source 110 that stores an amount of liquid NOx reductant such as, for example, ammonia (NH3), in a liquid storage medium. In one embodiment, the liquid storage medium is diesel exhaust fluid stored in a tank. Other liquid reductant storage mediums such as urea are also contemplated. -
System 100 also includes a secondreductant delivery system 122 that receives liquid reductant in the liquid storage medium released from theliquid reductant source 110, and provides the liquid reductant to theexhaust flow path 116 at a position upstream of theSCR catalyst 104. Liquid reductant passes through areductant supply line 123 fromreductant source 110 to adosing device 114 and fromdosing device 114 to aninjector 112 connected in fluid communication withexhaust flow path 116. Theinjector 112 is located upstream of theSCR catalyst 104.Injector 112 is supplied with liquid reductant fromreductant source 110 and is operable to inject or otherwise mix liquid reductant intoexhaust flow path 116 for mixing with exhaust gas.Reductant delivery system 122 may include sensors, control valves, heating sources, coolant lines, and other devices useful in the delivery of liquid reductant from thestorage source 110 to theexhaust flow path 116 in the desired amount, rate and timing. - In one embodiment, the exhaust aftertreatment system may include an
oxidation catalyst 130 which is in fluid communication withexhaust flow path 116 and is operable to catalyze oxidation of one or more compounds in the exhaust gas flowing throughexhaust flow path 116, for example, oxidation of unburned hydrocarbons or oxidation of NO to NO2.Oxidation catalyst 130 can be any of various flow-through oxidation catalysts. Generally,oxidation catalyst 130 includes a substrate with an active catalyst layer configured to oxidize at least some particulate matter (e.g., the soluble organic fraction of soot) in the exhaust and reduce unburned hydrocarbons and CO in the exhaust to less environmentally harmful compounds. For example, in some implementations, theoxidation catalyst 130 may sufficiently reduce the hydrocarbon and CO concentrations in the exhaust to meet the requisite emissions standards. - The exhaust aftertreatment system may also include a
diesel particulate filter 132 in fluid communication withexhaust flow path 116 and operable to reduce the level of particulates in exhaust flowing throughexhaust flow path 116. In an exemplary embodimentdiesel particulate filter 132 is a catalyzed soot filter. Thediesel particulate filter 132 can be any of various particulate filters known in the art configured to reduce particulate matter concentrations, e.g., soot and ash, in the exhaust gas to meet requisite emission standards. Thediesel particulate filter 132 includes a filter substrate that captures soot and other particulate matter generated by theengine 102. Thesystem 100 periodically regeneratesdiesel particulate filter 132 to remove particulate matter that has accumulated on the diesel particulate filter over time. For example,diesel particulate filter 132 can be regenerated by increasing the temperature of the exhaust gas above a threshold temperature corresponding with combustion of the particulate matter. - In certain implementations, the
system 100 includes an exhaust gas recirculation (EGR) line (not shown) configured to allow a portion of the exhaust gas generated by the engine to recirculate back into the engine for altering the combustion properties of theengine 102. The exhaust aftertreatment system may further include a hydrocarbon (HC) injector (not shown) which is supplied with HC from an HC reservoir and is operationally coupled to the exhaust stream at a position upstream ofSCR catalyst 104. Other embodiments ofsystem 100 may includeengine 102 having a common rail fuel system capable of injecting a post injection fuel where at least a portion of the post injection fuel does not combust to provide HC in the exhaust stream. Embodiments are also contemplated without a HC injector. Certain embodiments may also include an ammonia oxidation AMOX catalyst (not shown) at a position downstream of theSCR catalyst 104, which is operable to catalyze the reaction of NH3 which slips past theSCR catalyst 104. - Reductant gas or liquid injected into
exhaust flow path 116 is provided to theSCR catalyst 104 which is in flow communication withexhaust flow path 116 and is operable to catalyze the reduction of NOx.SCR catalyst 104 can be any of various catalysts known in the art. For example, in some implementations, the SCR catalyst with a zeolite based catalyst, such as a Cu-Zeolite or a Fe-Zeolite catalyst, or a vanadium based catalyst. -
Exhaust flow path 116, as illustrated schematically inFIG. 1 , may be provided in a variety of physical configurations. In an exemplary embodiment an exhaust flow path proceeds from the output of a turbocharger (not shown) ofengine 102 through a conduit to a structure containingoxidation catalyst 130 anddiesel particulate filter 132, through a second conduit to a structure containing theSCR catalyst 104 and through another conduit which outlets to the ambient environment. In other embodiments, the components of the exhaust gas after-treatment system can be positioned in any of various arrangements, and the system can include other components or fewer components. Generally, exhaust gas treated in the exhaust gas after-treatment system and released into the atmosphere consequently contains significantly fewer pollutants, such as diesel particulate matter, NOx, hydrocarbons, and carbon monoxide, than untreated exhaust gas. - The
system 100 further includes acontroller 124 that performs certain operations for controlling reductant delivery toexhaust flow path 116 fromfirst reductant source 108 andsecond reductant source 110 in response to a temperature condition associated with the exhaust system. As used herein, a temperature condition associated with the exhaust system can include a temperature condition ofSCR catalyst 104, a temperature condition of exhaust gas at the exhaust manifold or the connection ofengine 102 withexhaust flow path 116, a downstream temperature condition of the exhaust gas inexhaust flow path 116, or a temperature condition of a component of the exhaust system. The temperature condition can also be a combination, average, weighted average, of these temperature conditions or other suitable determination of a temperature condition associated with the exhaust system determined from temperature sensors, derived from temperature sensors, or determined from operating conditions. - In one embodiment,
controller 124 is configured to determine the temperature condition of the exhaust system is in a low temperature range and controlfirst reductant source 108 to provide gaseous reductant to theexhaust flow path 116.Controller 124 is also configured to determine the temperature condition of the exhaust system is above the low temperature range and controlsecond reductant source 110 to provide liquid reductant to theexhaust flow path 116. Thecontroller 124 may include modules structured to functionally execute operations to determine the temperature condition and control reductant delivery in response to the temperature condition. In certain embodiments, thecontroller 124 includes an exhaust system temperature condition module that is configured to determine the temperature condition associated with the exhaust system and a reductant source selection module configured to selectreductant source 108 orreductant source 110 in response to the temperature condition. -
Controller 124 is connected to various sensors to receive or determine operating parameters ofsystem 100 and to provide certain control outputs in response to the operating parameters according to programmed instructions. In the illustrated embodiment,controller 124 is connected toNOx sensors 140 andtemperature sensors 142 to receive inputs regarding the operation of the exhaust system and the performance, such as NOx conversion efficiency, of the aftertreatment system. Pressure sensor ordifferential pressure sensor 144 provides signals regarding the pressure associated withparticulate filter 132, andammonia sensor 146 provides signals regarding a mid-bed ammonia amount ofSCR catalyst 104 for feedback control of reductant delivery along withNOx sensors 140. Additional sensors associated with the exhaust system can be provided and are not shown, such as additional NOx and/or temperature sensors at other locations, other ammonia sensors, and flow sensors. -
Controller 124 may include one or more modules as discussed above structured to functionally execute the operations described herein. The description herein, including modules, emphasizes the structural independence of the aspects of thecontroller 124, and illustrates one grouping of operations and responsibilities of thecontroller 124. Other groupings that execute similar overall operations are understood within the scope of the present application. Modules may be implemented in hardware and/or software on computer readable medium, and modules may be distributed across various hardware or software components. -
Controller 124 forms a portion of a processing subsystem including one or more computing devices having memory as well as a number of inputs and outputs for interfacing with various sensors and subsystems ofsystem 100.Controller 124 can include an electronic circuit comprised of one or more components, including digital circuitry, analog circuitry, or both.Controller 124 may be a single device or a distributed device.Controller 124 may include one or more control algorithms defined by operating logic in the form of software instructions, hardware instructions, firmware instructions, dedicated hardware, or the like. - In one form,
controller 124 is of a programmable microcontroller solid-state integrated circuit type that includes memory and one or more central processing units. The memory ofcontroller 124 includes of one or more components and can be of any of volatile or nonvolatile, solid-state, optical media, magnetic media, combinations of these, or other types of memory.Controller 124 can include signal conditioners, signal format converters (such as analog-to-digital and digital-to-analog converters), limiters, clamps, filters, and the like as needed to perform various control and regulation operations described herein.Controller 124, in an exemplary embodiment, may be a type of controller sometimes referred to as an electronic or engine control module (ECM), electronic or engine control unit (ECU) or the like, that is directed to the regulation and control of engine operation. Alternatively,controller 124 may be dedicated to the control of just the operations described herein or to a subset of controlled aspects ofsystem 100. - An exemplary procedure to be performed by
controller 124 for determining a temperature condition and reductant source selection for delivery of reductant to exhaust flow path is described inFIG. 2 . InFIG. 2 ,procedure 200 includes anoperation 202 to determine an operating condition ofengine 102. Engine operating condition determinations can include determining operating conditions that produce exhaust gas to respond to a torque request or to satisfy a torque demand, that correspond to an engine start-up request or start-up condition, that correspond to an engine shut-down request or condition, or that correspond to an eminent engine shut-down condition. -
Procedure 200 further includes anoperation 204 to determine a temperature condition associated with the exhaust system. As discussed above, the temperature condition can correspond to a temperature of the exhaust gas at one or more locations, a temperature ofSCR catalyst 104, a temperature condition of a component of the exhaust system, or a combination of these. The temperature condition can be determined from a single input from a temperature sensor or combination of sensors, an average or other determination based on a number of inputs from one or more temperature sensors, an input from a virtual temperature sensor, or a derived or calculated value from operating conditions. -
Procedure 200 continues at conditional 206 to determine if the temperature condition associated with the exhaust system is greater than or equal to a liquid reductant threshold temperature. The liquid reductant threshold temperature can be, for example, a temperature at or above which liquid reductant is effectively hydrolyzed in the exhaust gas to prevent or reduce deposit formation in the exhaust system. Other liquid reductant threshold temperatures are also contemplated and not precluded. - If conditional 206 is negative,
procedure 200 continues atoperation 208 and provides the gaseous reductant fromgaseous reductant source 108 to the exhaust system. If conditional 206 is positive,procedure 200 continues atoperation 210 and provides liquid reductant fromliquid reductant source 110 to the exhaust system. - Providing gaseous reductant when the temperature condition is less than the liquid reductant temperature threshold enables treatment of NOx emissions in low temperature operating conditions while avoiding or minimizing the formation of reductant deposits typically formed by dosing of liquid reductant in low temperature conditions. Since the
first reductant source 108 including the solid storage media is used only during certain operating conditions, the stored amount of reductant in the solid storage media can be significantly less than what would be required if the solid storage media stored the entire reductant supply for all operating conditions. Thus, in one embodiment,first reductant source 108 includes replaceable cartridges of solid storage media with stored dry reductant that are removed and replaced with another cartridge when empty. - In other embodiment of
procedure 200, the engineoperating condition determination 202 and/or exhausttemperature condition determination 204 can include a reductant storage capacity determination of theSCR catalyst 104 and an eminent engine shut-down condition determination. If storage capacity onSCR catalyst 104 is available, an eminent engine shut-down condition determination can result in an operation to dose liquid reductant fromsecond reductant source 110 to store reductant onSCR catalyst 104 for NOx reduction in a subsequent engine cold start while the catalyst temperature is still above the liquid reductant dosing threshold. - In another embodiment, the engine
operating condition determination 202 and/or exhausttemperature condition determination 204 can include a reductant storage capacity determination of theSCR catalyst 104 and an engine shut-down condition determination. If storage capacity onSCR catalyst 104 is available, an engine shut-down condition determination can result in an operation to provide gaseous reductant fromfirst reductant source 108 to store reductant onSCR catalyst 104 for NOx reduction in a subsequent engine cold start while the catalyst temperature is below the liquid reductant dosing threshold. - In another embodiment, the engine
operating condition determination 202 and/or exhausttemperature condition determination 204 can include a reductant storage capacity determination of theSCR catalyst 104 and an engine start-up condition determination. The start-up condition can be determined based on, for example, ambient conditions, a door switch activation, a key-switch activation, a key-on delay timing, a time-of-day, a day of week, a preprogrammed schedule, an operator input, or other start-up indicator. If storage capacity onSCR catalyst 104 is available, an engine start-up determination can result in an operation to provide gaseous reductant fromfirst reductant source 108 to store reductant onSCR catalyst 104 for NOx reduction in the subsequent engine start-up while the catalyst temperature is below the liquid reductant dosing threshold. In one embodiment, gaseous reductant fromfirst reductant source 108 is provided upon engine start-up following a pre-determined amount of key-off time when ambient temperature is below a pre-determined threshold. - In still other embodiments, the
controller 124 is configured to use only one ofreductant sources controller 124 is configured to usedry reductant source 108 exclusively in response to an estimated urea deposit build-up or accumulation in the aftertreatment system exceeding a predetermined limit, or in response to a determination of a freezing condition associated withliquid reductant source 110 or any of its components connecting it the exhaust system. The determination of urea deposit thresholds or limits and frozen or potentially frozen/stuck/blocked conditions can be performed by any known technique. The determination of the freezing condition can be a determination of a cold weather condition likely to cause a freezing condition, of an actual frozen condition, or of a blocked condition associated with a temperature of the liquid reductant or a blockage preventing or reducing flow of the liquid reductant. In further embodiments, reductant from bothfirst reductant source 108 andsecond reductant source 110 is used simultaneously under certain operating conditions, such as during a transition from supplying reductant only from the dry reductant source to supplying reductant only from the liquid reductant source. - The schematic flow diagrams and related descriptions above provide illustrative embodiments of performing procedures for selective gaseous reductant and liquid reductant delivery in response to a temperature condition of the exhaust system. Operations illustrated are understood to be exemplary only, and operations may be combined or divided, and added or removed, as well as re-ordered in whole or part, unless stated explicitly to the contrary herein. The operations of the various embodiments can also be combined as a single embodiment. Certain operations illustrated may be implemented by a computer executing a computer program product on a non-transient computer readable storage medium, where the computer program product comprises instructions causing the computer to execute one or more of the operations, or to issue commands to other devices to execute one or more of the operations.
- Referring to
FIG. 3 , anapparatus including controller 124 includes an exhaust systemtemperature condition module 300 structured to determine a temperature condition associated with the exhaust system. Thecontroller 124 also includes a reductantsource selection module 302 structured to control the selection and dosing of gaseous reductant from thefirst reductant source 108 and liquid reductant from theliquid reductant source 110 in response to the temperature condition determination. - Exhaust system
temperature condition module 300 is structured to receive one ormore temperature inputs 306 associated with the exhaust system and provide an exhaust systemtemperature condition output 308. In one embodiment, the exhaust systemtemperature condition module 300 is further structured to determine the temperature condition in response to an imminent engine shut-down or completed engine shutdown. In yet a further embodiment, the exhaust systemtemperature condition module 300 is structured to determine the temperature condition in response to an engine start-up condition. - The reductant
source selection module 302 is structured to receive and interpret thetemperature condition output 308 and provide a reductantsource selection command 312 that controls providing gaseous reductant from thefirst reductant source 108 if thetemperature condition 308 is less than a liquidreductant temperature threshold 310 and providing liquid reductant from thesecond reductant source 110 if thetemperature condition 308 is greater than or equal to the liquidreductant temperature threshold 310. In further embodiments, reductantsource selection module 302 is structured to selectreductant source 108 orreductant source 110 based on thetemperature condition output 308 in response to an eminent engine shut-down condition, an engine shut-down condition, or engine start-up condition based on a reductant storage capacity ofSCR catalyst 104. Other embodiments contemplate reductantsource selection module 302 is structured to select one ofreductant source reductant source 108 in response to a urea deposit condition or a freezing condition associated withsecond reductant source 110. - As is evident from the figures and text presented above, a variety of embodiments according to the present disclosure are contemplated. Example of the contemplated embodiments are provided in the claims appended hereto, but are not limited to the claims.
- While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only certain exemplary embodiments have been shown and described. Those skilled in the art will appreciate that many modifications are possible in the example embodiments without materially departing from this invention. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the following claims.
- In reading the claims, it is intended that when words such as “a,” “an,” “at least one,” or “at least one portion” are used there is no intention to limit the claim to only one item unless specifically stated to the contrary in the claim. When the language “at least a portion” and/or “a portion” is used the item can include a portion and/or the entire item unless specifically stated to the contrary.
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EP14190284.1A EP2865860B1 (en) | 2013-10-28 | 2014-10-24 | Systems and methods for control of engine NOx emissions using liquid and dry reductant sources |
US15/230,988 US9771850B2 (en) | 2013-10-28 | 2016-08-08 | Systems and methods for control of engine NOx emissions using liquid and dry reductant sources |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107035476A (en) * | 2016-02-03 | 2017-08-11 | 通用汽车环球科技运作有限责任公司 | Generation and conveying of the ammonia in waste gas system |
US20170234188A1 (en) * | 2016-02-17 | 2017-08-17 | International Engine Intellectual Property Company , Llc | Scr after-treatment of engine exhaust gas |
US20170234189A1 (en) * | 2016-02-17 | 2017-08-17 | International Engine Intellectual Property Company , Llc | Scr after-treatment of engine exhaust gas |
US10724415B1 (en) * | 2019-04-22 | 2020-07-28 | Faurecia Emissions Control Technologies, Usa, Llc | Exhaust aftertreatment component with heat exchanger |
CN112840107A (en) * | 2018-10-02 | 2021-05-25 | 康明斯排放处理公司 | System and method for introducing dry chemical reductant into an aftertreatment system |
EP3882440A1 (en) * | 2020-03-19 | 2021-09-22 | Winterthur Gas & Diesel Ltd. | Device and method for providing a reducing agent |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2552040B (en) * | 2016-12-01 | 2018-08-01 | Univ Loughborough | Process for reducing nitrogen oxides |
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US20190234283A1 (en) * | 2018-01-31 | 2019-08-01 | International Engine Intellectual Property Company, Llc | ENGINE OUT NOx REDUCTION USING ENHANCED DEF |
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US11624333B2 (en) | 2021-04-20 | 2023-04-11 | Kohler Co. | Exhaust safety system for an engine |
WO2023239748A1 (en) * | 2022-06-09 | 2023-12-14 | Cummins Emission Solutions Inc. | Doser assembly with sensor assembly |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5628186A (en) * | 1993-05-07 | 1997-05-13 | Siemens Aktiengesellschaft | Method and apparatus for controlled introduction of a reducing agent into a nitrogen oxide-containing exhaust gas |
US5809775A (en) * | 1997-04-02 | 1998-09-22 | Clean Diesel Technologies, Inc. | Reducing NOx emissions from an engine by selective catalytic reduction utilizing solid reagents |
US6119448A (en) * | 1997-08-21 | 2000-09-19 | Man Nutzfahrzeuge Ag | Method for metering a reducing agent into NOx -containing exhaust gas of an internal combustion engine |
US6427439B1 (en) * | 2000-07-13 | 2002-08-06 | Ford Global Technologies, Inc. | Method and system for NOx reduction |
US7613561B1 (en) * | 2008-04-24 | 2009-11-03 | Honeywell International Inc | Measurement of NO and NO2 for control of selective catalytic reduction |
US7964163B2 (en) * | 2005-02-03 | 2011-06-21 | Amminex A/S | High density storage of ammonia |
US8607547B2 (en) * | 2008-12-08 | 2013-12-17 | Mitsubishi Heavy Industries, Ltd. | Flue gas purifying device |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5281403B1 (en) | 1991-09-27 | 1996-06-11 | Noell Inc | Method for converting urea to ammonia |
US6403046B1 (en) | 1999-07-26 | 2002-06-11 | Hera, Llc | Pollution control systems using urea and ammonia for the control of emissions from the flue gas of fossil fuel burning facilities |
DE19956493C1 (en) | 1999-11-24 | 2001-01-04 | Siemens Ag | Device for removing nitrogen oxides from I.C. engine exhaust gas comprises a flow-through measuring device that determines the amount of excess reductant arranged in the pressure relieving line |
EP1236499B1 (en) | 2001-03-02 | 2004-05-19 | Haldor Topsoe A/S | SCR process and apparatus for the reduction of NOx emissions |
US7485272B2 (en) | 2005-11-30 | 2009-02-03 | Caterpillar Inc. | Multi-stage system for selective catalytic reduction |
US7805929B2 (en) | 2005-12-21 | 2010-10-05 | Caterpillar Inc | Selective catalytic reduction system |
US8015801B2 (en) | 2006-09-18 | 2011-09-13 | Ford Global Technologies, Llc | Management of a plurality of reductants for selective catalytic reduction |
US7954311B2 (en) * | 2007-03-15 | 2011-06-07 | Ford Global Technologies, Llc | Ammonia vapor management system and method |
US8096110B2 (en) | 2008-11-19 | 2012-01-17 | GM Global Technology Operations LLC | Ammonia (NH3) storage control system and method at low nitrogen oxide (NOx) mass flow rates |
JP5293811B2 (en) | 2009-04-28 | 2013-09-18 | トヨタ自動車株式会社 | Engine exhaust purification system |
DE102010013696A1 (en) | 2010-04-01 | 2011-10-06 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Method for operating an exhaust gas treatment device |
CN103748329B (en) * | 2011-09-06 | 2018-02-06 | 万国引擎知识产权有限责任公司 | Cold start start unit for the system based on urea |
CN104053871B (en) | 2011-12-23 | 2018-05-01 | 沃尔沃拉斯特瓦格纳公司 | Exhaust after treatment system and the method for running the system |
-
2013
- 2013-10-28 US US14/064,591 patent/US9429060B2/en active Active
-
2014
- 2014-10-24 EP EP14190284.1A patent/EP2865860B1/en active Active
-
2016
- 2016-08-08 US US15/230,988 patent/US9771850B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5628186A (en) * | 1993-05-07 | 1997-05-13 | Siemens Aktiengesellschaft | Method and apparatus for controlled introduction of a reducing agent into a nitrogen oxide-containing exhaust gas |
US5809775A (en) * | 1997-04-02 | 1998-09-22 | Clean Diesel Technologies, Inc. | Reducing NOx emissions from an engine by selective catalytic reduction utilizing solid reagents |
US6119448A (en) * | 1997-08-21 | 2000-09-19 | Man Nutzfahrzeuge Ag | Method for metering a reducing agent into NOx -containing exhaust gas of an internal combustion engine |
US6427439B1 (en) * | 2000-07-13 | 2002-08-06 | Ford Global Technologies, Inc. | Method and system for NOx reduction |
US7964163B2 (en) * | 2005-02-03 | 2011-06-21 | Amminex A/S | High density storage of ammonia |
US7613561B1 (en) * | 2008-04-24 | 2009-11-03 | Honeywell International Inc | Measurement of NO and NO2 for control of selective catalytic reduction |
US8607547B2 (en) * | 2008-12-08 | 2013-12-17 | Mitsubishi Heavy Industries, Ltd. | Flue gas purifying device |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107035476A (en) * | 2016-02-03 | 2017-08-11 | 通用汽车环球科技运作有限责任公司 | Generation and conveying of the ammonia in waste gas system |
US20170234188A1 (en) * | 2016-02-17 | 2017-08-17 | International Engine Intellectual Property Company , Llc | Scr after-treatment of engine exhaust gas |
US20170234189A1 (en) * | 2016-02-17 | 2017-08-17 | International Engine Intellectual Property Company , Llc | Scr after-treatment of engine exhaust gas |
CN112840107A (en) * | 2018-10-02 | 2021-05-25 | 康明斯排放处理公司 | System and method for introducing dry chemical reductant into an aftertreatment system |
US10724415B1 (en) * | 2019-04-22 | 2020-07-28 | Faurecia Emissions Control Technologies, Usa, Llc | Exhaust aftertreatment component with heat exchanger |
EP3882440A1 (en) * | 2020-03-19 | 2021-09-22 | Winterthur Gas & Diesel Ltd. | Device and method for providing a reducing agent |
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EP2865860A1 (en) | 2015-04-29 |
US9429060B2 (en) | 2016-08-30 |
EP2865860B1 (en) | 2017-10-04 |
US9771850B2 (en) | 2017-09-26 |
US20160341089A1 (en) | 2016-11-24 |
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